MAX16818_15 Datasheet, PDF (1/25 Pages) Maxim Integrated Products – 1.5MHz, 30A High-Efficiency, LED Driver with Rapid LED Current Pulsing

MAX16818
EVALUATION KIT AVAILABLE
1.5MHz, 30A High-Efficiency, LED Driver
with Rapid LED Current Pulsing
General Description
The MAX16818 pulse-width modulation (PWM)
LED driver controller provides high-output-current
capability in a compact package with a minimum number
of external components. The MAX16818 is suitable for
use in synchronous and nonsynchronous step-down
(buck) topologies, as well as in boost, buck-boost, SEPIC,
and Cuk LED drivers. The MAX16818 is the first LED
driver controller that enables Maxim’s technology for
fast LED current transients of up to 20A/µs and 30kHz
dimming frequency.
This device utilizes average-current-mode control that
enables optimal use of MOSFETs with optimal charge and
on-resistance characteristics. This results in the minimized
need for external heatsinking even when delivering up
to 30A of LED current. True differential sensing enables
accurate control of the LED current. A wide dimming range
is easily implemented to accommodate an external PWM
signal. An internal regulator enables operation over a wide
input voltage range: 4.75V to 5.5V or 7V to 28V and above
with a simple external biasing device. The wide switching
frequency range, up to 1.5MHz, allows for the use of small
inductors and capacitors.
The MAX16818 features a clock output with 180° phase
delay to control a second out-of-phase LED driver to
reduce input and output filter capacitors size or to mini-
mize ripple currents. The MAX16818 offers programmable
hiccup, overvoltage, and overtemperature protection.
The MAX16818ETI+ is rated for the extended tempera-
ture range (-40°C to +85°C) and the MAX16818ATI+ is
rated for the automotive temperature range (-40°C to
+125°C). This LED driver controller is available in a lead-
free, 0.8mm high, 5mm x 5mm 28-pin TQFN package with
an exposed pad.
Applications
●● Front Projectors/Rear Projection TVs
●● Portable and Pocket Projectors
●● LCD TVs and Display Backlight
Package Information appears at end of data sheet.
Benefits and Features
●● Flexible Architecture Supports a Range of LED
LIghting Applications with Minimal Component Count
• Up to 30A Output Current
• 4.75V to 5.5V or 7V to 28V Input Voltage Range
• Average-Current-Mode Control
• True-Differential Remote-Sense Input
●● Frequency Management Reduces EMI and
Interference with Other System Clocks
• Programmable Switching Frequency or External
Synchronization from 125kHz to 1.5MHz
• Clock Output for 180° Out-of-Phase Operation
●● Integrated Protection Features and Thermally
Enhanced Package Improve System Reliability
• Output Overvoltage and Hiccup-Mode Overcurrent
Protection
• Thermal Shutdown
• Thermally Enhanced 28-Pin TQFN Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX16818ATI+
-40°C to +125°C 28 TQFN-EP*
MAX16818ETI+
-40°C to +85°C
28 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Simplified Diagram
7V TO 28V
IN
EN
ILIM
Q1
DH
MAX16818
Q2
DL
OVI
CSP
CLP
PGND
C1
VLED
L1
C2
Q3
R1
HIGH-FREQUENCY
PULSE TRAIN
NOTE: MAXIM TOPOLOGY
19-0666; Rev 4; 5/15